Hi folks ,as an owner poerator of a small dump truck compay and been in this bussines for 20 years I can say that I have plenty experience on this matter. currently I have a KW T800 H with new way air suspension that it's rated at 46K # the ride can not be better and when Im off roading ,if I lose traction I'll engage the diff locks and am good to go ,I still havent seen a truck with walking beam that does not have the diff locks ,so if I have it I'll use it ,I had a Pete 378 with low air leaf 40K# and I miss that truck a lot My other truck is a 378 with chalmers and im willing to swap it for the air leaf any time ,I also challenge anybody to replace a boken spring from a walking beam on the road side in 20 minutes like I can replace an air bag on that time with hardly any tools ,witch I never had to do because air bags dont brake as usual as spring leafs and let me point that my trucks are try axles with a pay load of 23 tons thats running 100k miles a year.